TSB 21-007-06 addrresses an issue with delayed engagement with the 545RFE transmission.

SYMPTOM/CONDITION:The customer may experience an initial delayed shift engagement following an extendedoff (not running) period of time, generally after being parked overnight. The initial shiftengagement may feel like a delay or slip when a transmission gear (reverse or drive) isfirst selected after engine start.The customer may also experience a MIL illumination. Investigation may determine thatthe MIL is due to one or more of the following Diagnostic Trouble Codes (DTC's):